Year	current US$
1990	268124117.839993
1991	294503930.070728
1992	301573872.313101
1993	290411490.858842
1994	295888446.713282
1995	291288223.908533
1996	234458621.423563
1999	113781220.755964
2000	111496877.873354
2001	123221148.936204
2002	137320357.223479
2003	152954427.709505
2004	193531814.333937
2007	423426723.44586
2014	280277724.138355
2015	273096737.338382
2016	244633091.555156
2017	259697234.094667
2018	289152475.375193
2019	323116436.401981
2020	343929753.79348
2021	429282885.912815